Ultrasonic velocity, density and viscosity have been measured in six binarymixtures of o-cresol,m-cresol, p-cresol, 1,4 dioxane, aniline and pyridine with benzyl benzoate as common component at 300C. Fromthe measured data, thermodynamic and other allied parameters have been computed and the intermolecular interactions are estimated in the light of the excess parameters.Also theoretical velocities are evaluated froma knowledge of the five theories FLT, CFT, NOMOTO, VANDAEL and JUNJIE. FLT,CFT,NOMOTOand JUNJIE appear to agreewellwith the experiment. In the mixtures of o-cresol, weak interactions and m-cresol and p-cresol, strong molecular interactions are suggested. In 1,4 dioxane system, weak interactions and dispersive forces and in the other two systems, strong AB interactions besides dipole-dipole type are suggested.